Ummm, all I know of is deleting your updates, but dont do that! Many bad glitches will return and you will not be able to play as many old Xbox games as before. Best thing to do is this:
1. Buy a memory card.
2. Stick it in the Xbox 360 console.
3. Take out the harddrive thing.
4. Start a new game in TES4O.
5. Do whatever glitches you need.
6. Take memory card out.
7. Put hardrive back in.
8. Load your game from the memory card.
9. Yay! You should have whatever you got from glitches.
If someone thinks otherwise then go ahead and say something different. Oh yea im not responsible for any breakage to your Xbox 360 console! (Not that it would break) so use at your own caution.